Retractable blade utility knife



FIG. 1 is a perspective view of a retractable blade utility knife, with the blade in a retracted position, showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right end elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left end elevational view thereof;

FIG. 7 is a bottom elevational plan view thereof; and,

FIG. 8 is a perspective view of a retractable blade utility knife, with the blade extended to a position of use relative to the knife handle. 

The ornamental design for a retractable blade utility knife, as shown and described. 